Importance

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Abstract

An amount of scale adhering onto inner surfaces of water tubes in any one of various boilers including a steam boiler, a hot water boiler, a waste heat boiler, and an exhaust gas boiler is accurately known by providing a temperature sensor at an appropriate position of the boiler. A plurality of water tubes (5, 6) connecting between an upper header (3) and a lower header (4) constitute an inner water tube row (7) and an outer water tube row (8). Inner longitudinal fins (9) close gaps between the adjacent inner water tubes (5, 5) except at a lower end of the inner water tube row (7). Outer longitudinal fins (11) close gaps between the adjacent outer water tubes (6, 6) except at an upper end of the outer water tube row (8). A plurality of upper outer lateral fins (17) are provided in a vertical direction on a surface constituting an inner peripheral surface of the outer water tube row (8) in a predetermined region extending upward from an intermediate portion in the vertical direction of each of the outer water tubes (6). A temperature sensor (29) is provided to one of the outer water tubes (6) at a position corresponding to a lower end of the predetermined region. An adhesion state of the scale is known based on a temperature detected by the temperature sensor (29).

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First Claim